code: def call_function(
      self,
      tx,
      args: "List[VariableTracker]",
      kwargs: "Dict[str, VariableTracker]",
  ) -> "VariableTracker":
      if (
          self.value is itertools.product
          and not kwargs
          and all(arg.has_unpack_var_sequence(tx) for arg in args)
      ):
          seqs = [arg.unpack_var_sequence(tx) for arg in args]
          items = []
          for item in itertools.product(*seqs):
              items.append(variables.TupleVariable(list(item)))
          return variables.ListIteratorVariable(
              items, mutable_local=MutableLocal()
          )
      elif (
          self.value is itertools.chain
          and not kwargs
          and all(arg.has_unpack_var_sequence(tx) for arg in args)
      ):
          seqs = [arg.unpack_var_sequence(tx) for arg in args]
          items = list(itertools.chain.from_iterable(seqs))
          return variables.ListIteratorVariable(
              items, mutable_local=MutableLocal()
          )
      elif self.value is itertools.accumulate:
          from .builtin import BuiltinVariable
  
          if any(
              key not in ["initial", "func"] for key in kwargs.keys()
          ):
              unimplemented(
                  "Unsupported kwargs for itertools.accumulate: "
                  f"{','.join(set(kwargs.keys()) - {'initial', 'func'})}"
              )
  
          acc = kwargs.get("initial")
  
          if len(args) in [1, 2] and args[0].has_unpack_var_sequence(
              tx
          ):
              seq = args[0].unpack_var_sequence(tx)
  
              if "func" in kwargs and len(args) == 1:
                  func = kwargs["func"].call_function
              elif len(args) == 2:
                  func = args[1].call_function
              elif len(args) == 1:
                  # Default to operator.add
                  func = BuiltinVariable(operator.add).call_function
              else:
                  unimplemented(
                      "itertools.accumulate can only accept one of: `func` kwarg, pos 2 arg"
                  )
          else:
              unimplemented(
                  "Unsupported arguments for itertools.accumulate"
              )
  
          items = []
          if acc is not None:
              items.append(acc)
          for item in seq:
              if acc is None:
                  acc = item
              else:
                  try:
                      acc = func(tx, [acc, item], {})
                  except Exception:
                      raise unimplemented(  # noqa: TRY200
                          f"Unexpected failure in invoking function during accumulate. Failed running func {func}({item}{acc})"
                      )
              items.append(acc)
  
          return variables.ListIteratorVariable(
              items, mutable_local=MutableLocal()
          )
      elif (
          self.value is itertools.combinations
          and not kwargs
          and len(args) == 2
          and args[0].has_unpack_var_sequence(tx)
          and args[1].is_python_constant()
      ):
          iterable = args[0].unpack_var_sequence(tx)
          r = args[1].as_python_constant()
  
          items = []
          for item in itertools.combinations(iterable, r):
              items.append(variables.TupleVariable(list(item)))
          return variables.ListIteratorVariable(
              items, mutable_local=MutableLocal()
          )
      elif self.value is itertools.groupby:
          if any(kw != "key" for kw in kwargs.keys()):
              unimplemented(
                  "Unsupported kwargs for itertools.groupby: "
                  f"{','.join(set(kwargs.keys()) - {'key'})}"
              )
  
          def retrieve_const_key(key):
              if isinstance(key, variables.SymNodeVariable):
                  return key.evaluate_expr()
              elif isinstance(key, variables.ConstantVariable):
                  return key.as_python_constant()
              else:
                  raise unimplemented(
                      "Unsupported key type for itertools.groupby: "
                      + str(type(key))
                  )
  
          if len(args) == 1 and args[0].has_unpack_var_sequence(tx):
              seq = args[0].unpack_var_sequence(tx)
              keyfunc = (
                  (
                      lambda x: (
                          retrieve_const_key(
                              kwargs.get("key").call_function(
                                  tx, [x], {}
                              )
                          )
                      )
                  )
                  if "key" in kwargs
                  else None
              )
          else:
              unimplemented(
                  "Unsupported arguments for itertools.groupby"
              )
  
          result = []
          try:
              for k, v in itertools.groupby(seq, key=keyfunc):
                  result.append(
                      variables.TupleVariable(
                          [
                              variables.ConstantVariable.create(k)
                              if variables.ConstantVariable.is_literal(
                                  k
                              )
                              else k,
                              variables.ListIteratorVariable(
                                  list(v), mutable_local=MutableLocal()
                              ),
                          ],
                          mutable_local=MutableLocal(),
                      )
                  )
          except Exception:
              raise unimplemented(  # noqa: TRY200
                  "Unexpected failure when calling itertools.groupby"
              )
          return variables.ListIteratorVariable(
              result, mutable_local=MutableLocal()
          )
      elif self.value is itertools.repeat:
          if len(args) < 2:
              return variables.RepeatIteratorVariable(
                  *args, mutable_local=MutableLocal()
              )
  
          from .builder import SourcelessBuilder
  
          return tx.inline_user_function_return(
              SourcelessBuilder()(tx, polyfill.repeat), args, kwargs
          )
      elif self.value is itertools.count:
          return variables.CountIteratorVariable(
              *args, mutable_local=MutableLocal()
          )
      elif self.value is itertools.cycle:
          return variables.CycleIteratorVariable(
              *args, mutable_local=MutableLocal()
          )
      else:
          return super().call_function(tx, args, kwargs)
  
imports: import itertools
  import operator
  from typing import Dict, List, Optional
  from ..None import polyfill, variables
  from ..exc import unimplemented
  from .base import MutableLocal, VariableTracker
  from .constant import ConstantVariable
label_desc: Use image node_id 5 for calling the ItertoolsVariable obj's underlying member method code with example usage: obj.call_function(tx, args, kwargs) and returns: variables, variables, variables, variables, variables, tx, key, variables, variables, key, variables, super